there are really two related problems here
I have a 2D matrix
A <- matrix(1:100,nrow=20,ncol =5)
S <- matrix(1:10,nrow=2,ncol =5)
#I want to subtract S from A. so that S would be subtracted from the
first 2 rows of
#A, then the next two rows and so on.
#I have a the same problem with a 3D array
# where I want to subtract Q for every layer (1-10) in Z
# I thought I solved this one with array(mapply("-",Z,Q),dim=dim(Z))
# but got the wrong answers
Z <- array(1:100,dim=c(2,5,10))
Q <- matrix(1:10,nrow=2,ncol =5)
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